John wallace jaxeman



Dec. 22, 1925. 1,566,604

' J. W. JAKEMAN.

SHEET DELIVERY MECHANISM OF PRINTING MACHINES Patented Dec. 22, 1925.

UNITED STATES TENT OFFICE.

JOHN WALLACE JAKEMA or ALTRINcHAM, ENGLAND, Assrorion ToL'IN oTYrE ANDMACHINERY LIMITED, or LONDON, ENGLAND, A BRITISH CO PANY;

SHEET-DELIVERY ivrriormn rsra' or remains MACHINES;

Application filed May 22, 1924. Serial no. 715,038.

To all whom it may concern:

Be it known that I, JOHN VVALLAoE J AKEMAN, a British subject, andresident of Linotype and Machinery \Vorks, Altrin cham, in the county ofChester, England, have invented new and useful Improvements inSheet-Delivery Mechanism of Printing Machines, of which the following isa specification.

This invention relates to sheet delivery mechanism of printing machinesin which the grippers for taking the sheets from the impression cylinderor other organ from which these grippers are to receive them, arecarried by a plurality of endless chains traversed continuously orintermittently by sprocket or equivalent gearing.

.In this construction of apparatus, the grippers and gripper pads aresecured. to shafts extend-ing transversely across the machine from chainto chain, which shafts are carried in brackets secured to these chains.

It has been found dil'licult to secure adequate rigidity of thebrackets, and consequently, excessive wear of the rivets or otherdevices by .which the brackets are attached to the chain, has arisen, I

The effect of the lackof rigidity in question is particularly markedwhen the shaftcarrying brackets are in their Vertical positions, as forexample, when the respective part of the chain is passing over theabovementioned sprocket gearing, owing to the fact that the weight ofthe shafts and the devices carried. thereby, then exerts a shear ingaction upon the aforesaid rivets. It is further to be noted that theserivets are also subjected to a shearing action during the operation ofthe gripper-opening cams.

According to the present invention the above-mentioned defects areovercome by providing the brackets with abutments which, at the requiredstages of the operation of the chains, come into operative contact withco-operating abutments on the chains.

In the accompanying drawings which are to be taken as part of thisspecification and read therewith Figure 1 is a sectional view showing inelevation one of a pair of sprocket wheels and a portion of itsrespective chain, the lat ter provided with means according to oneconstructional form of the invention, and

I Figures 2 and 3 are views each similar to Figure 1, showing otherconstructional forms of the invention. v i

In each ofthe figures, the gripper shaft and gripper pad shaft arerespectively idem tified by the reference numerals 1, 2, while in Figure1, one of the grippers and the cor responding gripper pad, areshown indotted lines and these are respectively identified by thereferencefnumerals 3, 41.. In igure 1 there are further shown in dottedlines, one of the gripper-closing springs 5. and gripper-opening cams 6,it being observed that the particular gripper 3 shown, is represented.in the position; in which it is just v about to engage a sheet betweenitself and the pad 4. v I H The chain 7 shown fragmentarily in each ofthe figures, is the distant on'eof a pair carrying the shafts 1, 2, itbeing understood that the lines on which the sections whereon theseviews are taken, are located between the said pair of chains and betweenthe pair of sprocket wheels 8 engaging those chains, and for thatreason, only the distant one o'f said wheels is represented in Figure 1,this wheel, as ordinarily, being fast to a shaft'Q;

As before mentioned, and as ordinarily, the gripper shaft 1 and gripperpad. shaft 2 are, at each end, attached to the respective chain 7, by abracket 10 which is rigidly see cured to said chain by. the two rivets11 of the particular chain link to which the attachment is made. v I

.According to the, present invention the dificulties arising out of thebefore mentioned want of rigidity of the brackets 10, is overcome byproviding the latter with abutments which, at the required stages ofoperation of the chains 7 come into operative contact with co-operatingabutments on said chains themselves.

These abutments may beof various forms, and for that reason, thoserepresented in the drawings, are to be taken merely as examples.

In the constructional form shown in Figure 1, the bracket abutments 12are formed on extensions at the leading and following ends of thebrackets 10 and are adaptedto engage with inwardly presented abutinents13 on plates 14 attached to certain chain links in advance, and totherear, of the links to which the said brackets are themselves attached.By this arrangement, as is clearly apparent from Figure 1, practicallycomplete rigidity of the brackets 10, is obtained v *at that juncturethe abutments 12 are in close co-operation with the abutments 13.

In the constructional form illustrated inv Figure 2, which is adapted toprovide the necessary rigidity of the brackets when incorporated in oneand the same apparatus.

The same result as that attained by the combined arrangement illustratedin Figure 2, can be obtained by providing the bracket plates 10 wit-harcuate slots 18 as shown in Figure 3, to accommodate the extended endsof the particular chain rivets 19 which register with said slots, thelength of the slots 18 being such that these rivets, during the straightflight of the chains 7 are in contact with the upper or outer ends ofthe slots, as indicated in full lines, and during the passage of therespective parts of the chains around the sprockets, arein contact withthe lower or inner ends of such slots,

as shown in dotted lines.

Having described my invention, I declare that what I claim and desire tosecure by Letters Patent is 1. In a sheet delivery mechanism of printingmachines, the combination with a travelling chain and a gripper shaftcarried in a bracket attached to the chain, of an abut-- ment on thebracket so located as to engage a link of the chain other than that towhich the bracket is attached, only when the chain is deflected from astraight path. 7

2. In sheet delivery mechanism of printing machines, the combinationwith a travelling chain and a gripper shaft carried in a bracketattached to the chain, of an abutment on the bracket so located as toengage a link of the chain other than that to which 65 the bracket isattached, only during the straight flights of the chain.

3. In sheet delivery mechanism of printing machines, the combinationwith a travelling chain and a gripper shaft carried in a bracketattached to the chain, of an abutment on the leading end of the bracketand an abutment on the following end of the bracket, that on the leadingend being adapted to engage a link of the chain in advance, and that onthe following end being adapted to engage a link of the chain to therear of, that to which the bracket is attached. 1

4. In sheet delivery mechanism of printing machines, the combinationwith a travelling chain and a gripper shaft carried in a bracketattached to the chain 'of abutments on the bracket respectively locatedso as to engage a link of the chain other than-that to which the bracketis attached when the chain ed at the leading and following ends of thebracket, and extended chainlink pivots movable within those slots to thelimits de- 8 fined by such abutments.

In testimony'whereof I have affixed my signature hereto.

JOHN IVALLAOE JAKEMAN.

